Passengers are seen aboard a CRH6 intercity train with the four-car configuration during a test ride in Qingdao, east China's Shandong Province, Sept. 9, 2017. China's CRH6A-A and CRH6F-A intercity trains, with the four-car configuration, went off the production line in Qingdao on Saturday. (Xinhua/Zhang Jingang)
